Rapiscan TSA TPM-903B Operation And Service Manual - page 28
TSA TPM903 Operations and Service Manual
Doc: # 5058 Rev. A
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4.3. COMPONENTS
1. The TPM Controller is installed on Pillar 1 of the two vertical pillars. It is made up of the
following components:
1.1. The SC-771 board is the computer board for the system, and uses program software to run
the unit and perform all functions. The SC-771 receives 12VDC from a dc to dc converter and
uses another dc-dc converter to supply the ±5 Vdc required by its on-board circuitry.
The SC-771 board uses highly integrated components. If a failure occurs in the digital portion of
the board, it must be replaced.
1.2. The GHA-472 board provides regulated dc high voltage to the voltage divider networks
which are attached to the photo-multiplier tube on the detectors.
2. The DA372 Detector Assembly consists of a plastic scintillation detector coupled to a photo-
multiplier tube through a plastic light pipe, plug-on base with voltage divider network and
mounting hardware. The gamma ray is converted to photons (scintillation), which are then
converted into a voltage pulse on the GHA-472 board.
3. The battery module consists of three battery holders which hold a total of six "D" size alkaline
cells. The system can also be operated from a 100 - 240 volt, 50 - 60Hz ac outlet.
4. The Infrared detector is a passive type occupancy detector.
5. Alarm LED and buzzer - A red LED and piezo-electric buzzer are used to indicate a Radiation
Alarm.
6. Ready LED - A green ready LED indicates the monitor is on and ready to scan.